JP2014108630A - Four wheel drive vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a four wheel drive vehicle capable of inhibiting foreign objects from intruding into a motor for driving front wheels.SOLUTION: A four wheel drive vehicle 100 includes: a motor 33 which drives front wheels 11; an engine 1 which drives rear wheels 7; and a main transmission 2 which changes a speed of the output of the engine 1. The motor 33 is provided in a case 3 disposed at the rear wheel 7 side relative to the main transmission 2. The case 3 is disposed at the upper side relative to a front wheel differential device 9.

Description

  The present invention relates to a four-wheel drive vehicle including a motor for driving front wheels and an engine for driving rear wheels.

  Conventionally, a four-wheel drive vehicle including a motor that drives front wheels and an engine that drives rear wheels is known (see, for example, Patent Document 1).

  In the four-wheel drive vehicle of Patent Document 1, engine power is transmitted to the rear wheels via an automatic transmission, a propeller shaft, and a rear differential gear, and motor power is transmitted to the front wheels via a front differential gear.

JP 2000-127790 A

  Here, in the conventional four-wheel drive vehicle disclosed in Patent Document 1, when the motor is disposed in the vicinity of the front differential gear, foreign matter (for example, muddy water, sand, etc.) is present in the motor depending on the traveling environment. Because it is easy to apply, foreign matter can easily enter the motor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a four-wheel drive vehicle capable of suppressing foreign matter from entering a motor that drives a front wheel. It is.

  A four-wheel drive vehicle according to the present invention includes a motor that drives front wheels, an engine that drives rear wheels, and a transmission that changes the output of the engine. And a motor is provided in the case arrange | positioned at the output side of a transmission, and the case is arrange | positioned above with respect to the differential apparatus for front wheels.

  As described above, the case in which the motor is housed is arranged on the upper side with respect to the front wheel differential device, so that the case can be made less likely to be covered with foreign matter, so that foreign matter can be prevented from entering the motor that drives the front wheel. can do.

  In the four-wheel drive vehicle, a power transmission mechanism for transmitting the power of the motor to the front wheel propeller shaft may be provided in the case, and the motor may be disposed on the transmission side of the power transmission mechanism. .

  If comprised in this way, a motor can be arrange | positioned in the location with high intensity | strength of a case.

  In the four-wheel drive vehicle, a power transmission shaft for transmitting power from the engine is provided coaxially with the rotation shaft of the motor in the case. The motor is used for a power transmission mechanism, a front wheel propeller shaft, and a front wheel. The engine may be connected to the front wheel via a differential device, and the engine may be connected to the rear wheel via a transmission, a power transmission shaft, a rear wheel propeller shaft, and a rear wheel differential device.

  According to the four-wheel drive vehicle of the present invention, foreign matter can be prevented from entering the motor that drives the front wheels.

1 is a schematic configuration diagram illustrating a four-wheel drive vehicle according to an embodiment of the present invention. It is a figure for demonstrating the positional relationship in the height direction of the case of the four-wheel drive vehicle of FIG. 1, and the differential apparatus for front wheels. It is the schematic block diagram which showed the four-wheel drive vehicle by the modification of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIG. 1 and FIG. 2, the four-wheel drive vehicle 100 by one Embodiment of this invention is demonstrated.

  The four-wheel drive vehicle 100 is a hybrid vehicle that employs a standby four-wheel drive system based on the FR (front engine / rear drive) system. The four-wheel drive vehicle 100 is configured to be switchable between a two-wheel drive state in which only the rear wheel 7 is driven and a four-wheel drive state in which both the rear wheel 7 and the front wheel 11 are driven.

  Specifically, as shown in FIG. 1, a four-wheel drive vehicle 100 is housed in an engine 1 that drives a rear wheel 7, a main transmission 2 that changes the output of the engine 1, and a case 3. And a motor 33 for driving the motor.

  The engine (internal combustion engine) 1 is a known power device that outputs power by burning fuel such as a gasoline engine or a diesel engine. The engine 1 is configured to be able to control operation states such as a throttle opening (intake air amount) of a throttle valve provided in an intake passage, fuel injection amount, ignition timing, and the like. An output shaft (crankshaft) of the engine 1 is connected to the main transmission 2.

  The main transmission 2 includes, for example, a torque converter and an automatic transmission. The torque converter has an input-side pump impeller, an output-side turbine runner, and the like, and is configured to transmit power between the pump impeller and the turbine runner via a fluid (hydraulic oil). . The pump impeller is connected to the output shaft of the engine 1, and the turbine runner is connected to the input shaft of the automatic transmission via the turbine shaft. The automatic transmission includes a friction engagement element, a planetary gear device, and the like, and is configured to establish a plurality of shift stages by selectively engaging the friction engagement element. An output shaft of the automatic transmission is connected to the auxiliary transmission 31. The main transmission 2 is an example of the “transmission” in the present invention.

  The case 3 is attached to the output side of the main transmission 2 (the side opposite to the engine 1). In other words, the case 3 is disposed closer to the rear wheel 7 than the main transmission 2 and the front wheel differential device 9.

  The case 3 includes a sub-transmission 31 to which the output shaft of the main transmission 2 is coupled, a rear wheel output shaft 32 that is an output shaft of the sub-transmission 31, a motor 33 that drives the front wheels 11, a power A transmission mechanism 34 and a front wheel output shaft 35 are accommodated. The rear wheel output shaft 32 is an example of the “power transmission shaft” in the present invention.

  The auxiliary transmission 31 includes a planetary gear device and the like, and is configured to be able to select a high range or a low range. For example, when the high range is selected, the auxiliary transmission 31 transmits the rotation of the output shaft of the main transmission 2 to the rear wheel output shaft 32 as it is, and when the low range is selected, the main transmission The rotation of the output shaft 2 is decelerated and transmitted to the rear wheel output shaft 32.

  The rear wheel output shaft 32 is rotatably supported by the case 3, and is arranged coaxially with the output shaft of the main transmission 2 (the input shaft of the case 3) and the rotation shaft of the motor 33. The rear wheel propeller shaft 4 is connected to the rear wheel output shaft 32 via a constant velocity universal joint 4a. A rear wheel 7 is connected to the rear wheel propeller shaft 4 via a constant velocity universal joint 4 b, a rear wheel differential device 5, and a rear wheel drive shaft 6.

  The motor 33 mainly functions as an electric motor, and also functions as a generator depending on the situation. The motor 33 is, for example, an AC synchronous motor, and includes a rotor 33a made of a permanent magnet and a stator 33b around which a three-phase winding is wound. A motor output shaft 33c formed in a cylindrical shape is integrally connected to the rotor 33a. A rear wheel output shaft 32 is disposed inside the motor output shaft 33c. The stator 33b is fixed to the case 3.

  The motor 33 is connected to a battery via an inverter. The inverter converts the direct current supplied from the battery into an alternating current to drive the motor 33 (powering control), and converts the alternating current generated by the motor 33 into a direct current and outputs it to the battery (regenerative control). )Is possible.

  The power transmission mechanism 34 includes sprockets 34a and 34b and a chain 34c. The sprocket 34a is connected to the motor output shaft 33c, and the sprocket 34b is connected to the front wheel output shaft 35. The chain 34c is wound between the sprockets 34a and 34b. That is, the power transmission mechanism 34 has a function of transmitting the power of the motor output shaft 33c to the front wheel output shaft 35 disposed in parallel with the motor output shaft 33c in the vehicle width direction.

  The front wheel output shaft 35 is rotatably supported by the case 3 and is disposed in parallel with the rear wheel output shaft 32 and the motor output shaft 33c. The front wheel propeller shaft 8 is connected to the front wheel output shaft 35 via a constant velocity universal joint 8a. A front wheel 11 is connected to the front wheel propeller shaft 8 via a constant velocity universal joint 8b, a front wheel differential device 9, and a front wheel drive shaft 10. The front wheel propeller shaft 8 is disposed on the left side with respect to the engine 1, the main transmission 2, and the rear wheel propeller shaft 4.

  Here, in the case 3, the sub-transmission 31, the motor 33, and the power transmission mechanism 34 are sequentially arranged from the front side to the rear side. That is, the motor 33 is arranged on the main transmission 2 side (front side) with respect to the power transmission mechanism 34.

  Further, as shown in FIG. 2, the case 3 that houses the motor 33 is disposed on the upper side in the vertical direction (Z direction) with respect to the front wheel differential device 9. FIG. 2 is a diagram showing the positional relationship between the case 3 and the front wheel differential device 9 when the four-wheel drive vehicle 100 is viewed from the side. Specifically, the lower end portion of the case 3 is disposed above the lower end portion of the front wheel differential device 9. Further, the height position of the rear wheel output shaft 32 (see FIG. 1) housed in the case 3 is higher than the height position of the front wheel drive shaft 10 (see FIG. 1) connected to the front wheel differential device 9. It is arranged above. For this reason, the front-wheel propeller shaft 8 extending from the case 3 to the front-wheel differential device 9 is disposed so as to be inclined.

  As shown in FIG. 1, in the four-wheel drive vehicle 100, the power from the engine 1 is transmitted from the main transmission 2, the auxiliary transmission 31, the rear wheel output shaft 32, the rear wheel propeller shaft 4, and the rear wheel power. Power transmitted from the motor 33 is transmitted to the rear wheel 7 via the differential device 5 and the rear wheel drive shaft 6, and the power from the motor 33 is transmitted to the power transmission mechanism 34, the front wheel output shaft 35, the front wheel propeller shaft 8, the front wheel differential device 9, and It is transmitted to the front wheel 11 via the front wheel drive shaft 10. In the four-wheel drive vehicle 100, the power of the engine 1 is not transmitted to the front wheels 11, and the power of the motor 33 is not transmitted to the rear wheels 7.

  In the four-wheel drive vehicle 100, the two-wheel drive state in which the engine 1 drives the rear wheel 7 and the four-wheel drive state in which the engine 1 drives the rear wheel 7 and the motor 33 drives the front wheel 11 are in the traveling state. It is switched appropriately according to the above. For example, the four-wheel drive vehicle 100 is set to a two-wheel drive state during steady running or the like, and is set to a four-wheel drive state when starting or running on a low μ road.

-Effect-
In the present embodiment, as described above, the case 3 in which the motor 33 for driving the front wheels 11 is accommodated is disposed on the upper side with respect to the front wheel differential device 9, so that the motor for driving the front wheels is the front wheel differential device. As compared with the case where it is arranged in the vicinity of the wheel, it is possible to make the case 3 less likely to be exposed to foreign matters (for example, muddy water, sand, etc.). it can. Further, the motor 33 can be prevented from being damaged due to interference with the road surface.

  In the present embodiment, the mounting space for the motor 33 is reduced by attaching the case 3 in which the motor 33 is stored to the output side of the main transmission 2 as compared with the case where the motor is disposed in the vicinity of the front wheel differential device. Since it can be widened, the output of the motor 33 can be increased.

  In the present embodiment, the motor 33 can be disposed at a location where the strength of the case 3 is high by disposing the motor 33 on the main transmission 2 side of the power transmission mechanism 34 in the case 3. The support strength of 33 can be improved.

-Other embodiments-
In addition, embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, in the present embodiment, the example in which the motor 33 is disposed on the main transmission 2 side with respect to the power transmission mechanism 34 in the case 3 is shown, but the present invention is not limited to this, and the four-wheel drive vehicle according to the modification shown in FIG. As in the case of 200, the motor 33 may be disposed on the rear side of the power transmission mechanism 34 in the case 3.

  In the present embodiment, the main transmission 2 including the stepped automatic transmission having the friction engagement element and the planetary gear device is shown. However, the main transmission is not limited to this, and the main transmission has no gear ratio. You may include the continuously variable transmission (CVT: Continuously Variable Transmission) adjusted to a step. Further, the main transmission may be a manual transmission (manual transmission).

  In the present embodiment, the power transmission mechanism 34 has the sprockets 34a and 34b and the chain 34c. However, the present invention is not limited to this, and the power transmission mechanism may have a counter gear unit.

  In the present embodiment, the front wheel propeller shaft 8 is disposed on the left side with respect to the rear wheel propeller shaft 4. However, the present invention is not limited to this, and the front wheel propeller shaft is disposed with respect to the rear wheel propeller shaft. It may be arranged on the right side.

  The present invention is applicable to a four-wheel drive vehicle including a motor that drives front wheels and an engine that drives rear wheels.

1 Engine 2 Main transmission (transmission)
3 Case 4 Propeller shaft for rear wheel 5 Differential device for rear wheel 7 Rear wheel 8 Propeller shaft for front wheel 9 Differential device for front wheel 11 Front wheel 32 Output shaft for rear wheel (power transmission shaft)
33 motor 34 power transmission mechanism 100 four-wheel drive vehicle

Claims (3)

A motor that drives the front wheels;
An engine that drives the rear wheels,
A four-wheel drive vehicle comprising a transmission for shifting the output of the engine,
The motor is provided in a case disposed on the output side of the transmission,
The four-wheel drive vehicle according to claim 1, wherein the case is disposed on an upper side with respect to the front wheel differential device. The four-wheel drive vehicle according to claim 1,
In the case, a power transmission mechanism for transmitting the power of the motor to the front wheel propeller shaft is provided,
The four-wheel drive vehicle, wherein the motor is disposed on the transmission side with respect to the power transmission mechanism. The four-wheel drive vehicle according to claim 1 or 2,
In the case, a power transmission shaft for transmitting power from the engine is provided coaxially with the rotation shaft of the motor,
The motor is connected to the front wheel via a power transmission mechanism, a front wheel propeller shaft and the front wheel differential device,
The four-wheel drive vehicle, wherein the engine is connected to the rear wheel via the transmission, the power transmission shaft, a rear wheel propeller shaft, and a rear wheel differential device.

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